122 



DEGLUTITION. 



the stomach. The tongue, cheeks, pharynx, and oesophagus 

 or gullet are successively brought into play for the propulsion 



Fig. 65. 



of the bolus, and in ruminating animals a process of regurgi, 

 tation is also witnessed as one of the natural acts in connec- 

 tion with digestion. 



